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The cosine of $\frac{\pi}{8}$ equals $0.92388$
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$\frac{5^2- 7^x}{0.92388}=\frac{9}{5}$
Learn how to solve trigonometric equations problems step by step online. Solve the equation (5^2-7^x)/cos(pi/8)=9/5. The cosine of \frac{\pi}{8} equals 0.92388. Simplify the fraction \frac{5^2- 7^x}{0.92388}. Calculate the power 5^2. Divide both sides of the equation by 1.082397.